a swelling (= an area that is larger and rounder than normal) on the surface of the skin that is filled with liquid and is caused, for example, by rubbing or burning （皮膚上摩擦或燙等引起的）水疱，疱 These shoes have given me blisters on my heels. 這雙鞋讓我的腳後跟起了水泡。 He’d got blisters on his feet from running. 他的腳因爲跑步起了水疱。 There was a blister on her cheek where the boiling milk had splashed her. 沸騰的牛奶濺到她的地方，她的臉頰上起了一個水泡。
a similar swelling, filled with air or liquid, on metal, painted wood or another surface （金屬、油漆過的木頭或其他表面上的）泡，氣泡，水泡
Word OriginMiddle English: perhaps from Old French blestre ‘swelling, pimple’.